[issue14744] Use _PyUnicodeWriter API in str.format() internals

[Serhiy Storchaka]

Serhiy Storchaka <storchaka at gmail.com> added the comment:

> If this patch is accepted, it's more to go even deeper: use _PyUnicodeWriter in long_to_decimal_string() for example.

long_to_decimal_string() is already creates a string of known size. How
_PyUnicodeWriter can help here?

Issue3451 looks much more promising for int formatting. But it will take
a lot of time to carefully check this.

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